United States of America Naval Academy Annapolis Maryland = Diplomacy of Divine Power = There are two major types of submarines in the United States = Navy ballistic missile submarines and attack submarines which include the USS Annapolis. In the U.S. Navy all combatant submarines are nuclear-powered. Ballistic submarines have a single strategic mission carrying nuclear submarine-launched ballistic missiles. Attack submarines have several tactical missions including sinking ships and submarines launching cruise missiles and gathering intelligence which is supported by the powerful National Security Agency (NSA) based at Fort Meade and at the important outpost in Carroll County Maryland.